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Causes And Operator Prevention Of Kickback; Safety Guidelines - Definitions - Black & Decker CS1020 Instruction Manual

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operation where the cutting tool
own cord. Contact with a "live" wire
may contact hidden wiring or its
will also make exposed metal parts of
the tool "live" and shock the operator.
or straight edge guide. This improves
• When ripping, always use a rip fence
the accuracy of cut and reduces the
chance for blade binding.
• Always use blades with correct size
holes. Blades that do not match the
and shape (diamond vs. round) arbor
mounting hardware of the saw will run
eccentrically, causing loss of control.
blade washers or bolts. The blade
• Never use damaged or incorrect
washers and bolt were specially
designed for your saw, for optimum
performance and safety of operation.
CAUSES AND OPERATOR
PREVENTION OF KICKBACK:
• Kickback is a sudden reaction to a
pinched, bound or misaligned saw
blade, causing an uncontrolled saw to
lift up and out of the workpiece toward
the operator.
• When the blade is pinched or bound
tightly by the kerf closing down, the
blade stalls and the motor reaction
drives the unit rapidly back toward the
operator.
• If the blade becomes twisted or
misaligned in the cut, the teeth at the
back edge of the blade can dig into the
top surface of the wood causing the
blade to climb out of the kerf and jump
back toward operator.
• Kickback is the result of tool misuse
and/or incorrect operating procedures
or conditions and can be avoided by
taking proper precautions as given
below.
a. Maintain a firm grip with both
hands on the saw and position
resist KICKBACK forces. Kickback
your body and arm to allow you to
forces can be controlled by the
operator, if proper precautions are
taken.
b. When blade is binding, or when
interrupting a cut for any reason,
release the trigger and hold the
saw motionless in the material
until the blade comes to a
complete stop. Never attempt to
remove the saw from the work or
pull the saw backward while the
blade is in motion or KICKBACK
may occur. Investigate and take
corrective actions to eliminate the
cause of blade binding.
c. When restarting a saw in the
workpiece, center the saw blade
in the kerf and check that the saw
material. If saw blade is binding, it
teeth are not engaged into the
may walk up or KICKBACK from the
workpiece as the saw is restarted.
d. Support large panels to minimize
KICKBACK. Large panels tend to
the risk of blade pinching and
sag under their own weight. Support
must be placed under the panel on
both sides, near the line of cut and
near the edge of the panel.
blade. Unsharpened or improperly
e. Do not use dull or damaged
set blades produce narrow kerf
causing excessive friction, blade
binding, and KICKBACK.
f. Blade depth and bevel adjusting
secure before making cut. If blade
locking levers must be tight and
adjustment shifts while cutting, it
may cause binding and KICKBACK.
g. Use extra caution when making a
other blind areas. The protruding
"Pocket Cut" into existing walls or
blade may cut objects that can
cause KICKBACK.
SAVE THESE INSTRUCTIONS
SAFETY GUIDELINES -
It is important for you to read and
DEFINITIONS
understand this manual. The information
it contains relates to protecting YOUR
SAFETY and PREVENTING
PROBLEMS. The symbols below are
used to help you recognize this
information.
Indicates an imminently
hazardous situation which, if not avoided,
DANGER:
will result in death or serious injury.
Indicates a potentially
hazardous situation which, if not avoided,
WARNING:
could result in death or serious injury.
Indicates a potentially
haz ard ous situation which, if not avoided,
CAUTION:
may result in minor or mod er ate injury.
Used without the safety
alert symbol indicates potentially
CAUTION:
26
hazardous situation which, if not avoided,
may result in property damage.
ADDITIONAL SAFETY RULES:
SE THESE INSTRUCTIONS
CIRCULAR SAWS
WARNING: Some dust created by
power sanding, sawing, grinding,
drilling, and other construction
activities contains chemicals known
to cause cancer, birth defects or
other reproductive harm. Some
• lead from lead-based paints,
examples of these chemicals are:
• crystalline silica from bricks and
cement and other masonry products,
• arsenic and chromium from
chemically-treated lumber (CCA).
Your risk from these exposures varies,
depending on how often you do this type
of work. To reduce your exposure to these
chemicals: work in a well ventilated area,
and work with approved safety equipment,
such as those dust masks that are
specially designed to filter out microscopic
particles.
• Avoid prolonged contact with dust
from power sanding, sawing,
grinding, drilling, and other
construction activities. Wear
protective clothing and wash
Allowing dust to get into your mouth,
exposed areas with soap and water.
eyes, or lay on the skin may promote
absorption of harmful chemicals.
WARNING: Use of this tool can
generate and/or disburse dust, which
may cause serious and permanent
respiratory or other injury. Always use
NIOSH/OSHA approved respiratory
protection appropriate for the dust
exposure. Direct particles away from
face and body.
CAUTION: Wear appropriate hearing
protection during use. Under some
conditions and duration of use, noise
from this product may contribute to
hearing loss.
• Snagging the lower guard on a
surface below the material being cut
control. The saw can lift partially out of
can momentarily reduce operator
the cut increasing the chance of blade
twist. Ensure there is sufficient
clearance under the workpiece.
• When necessary to raise lower guard
• KEEP THE BLADES CLEAN AND
manually, use the retracting lever.
SHARP. Sharp blades minimize stalling
and kickback. The use of dull and/or dirty
blades can increase the saw loading
causing the operator to push harder
which promotes twisting.
DANGER: LACERATION HAZARD.
AREA. Keep hands away from blades.
KEEP HANDS AWAY FROM CUTTING
Never place hands in front of or behind
the path of the blade while cutting. Do
not reach underneath work while blade
is rotating. Do not attempt to remove cut
material when blade is moving.
• SUPPORT LARGE PANELS. Large
panels must be supported as shown
(figure 1) in this manual to minimize the
risk of blade pinching and kickback.
Material supported only at the ends
(figure 2) will lead to blade pinching.
When cutting operation requires the
resting of the saw on the workpiece, the
saw shall be rested on the larger portion
and the smaller piece cut off.
1
2
• USE ONLY CORRECT BLADES AND
WHEN MOUNTING BLADES. Do not
BLADE ASSEMBLY COMPONENTS
use blades with incorrect size holes.
Never use defective or incorrect blade
washers or bolts. Follow blade assembly
procedures.
• ADJUSTMENTS. Before cutting be sure
depth and bevel adjustments are tight.
• SUPPORT AND SECURE THE WORK
PROPERLY. Insure that the material to
be cut is clamped (figure 3) and solidly
supported and balanced on a strong,
stable and level work surface. Support
the work so that the wide portion of the
saw shoe is on the portion of the
material that doesn't fall after the cut is
27

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